I have added to our custom event bus a FIFO queue as a target.

When eventbridge is connected to a fifo queue the MessageGroupId property is required.

Is it possible to configure dynamically that value?

For example: I have a fifo queue where I put events from different users. Every event, inside the detail property, has a property uuid with the user identifier.
I would like to use this property instead of e constant value as MessageGroupId.
In this way, all events for the same user are going to be processed in the order.

Thank you!

This is not possible as of 4/8/2021.

The EventBridge input transformation puts the transformed payload into the MessageBody parameter of the SQS SendMessage API.

Any other API parameters cannot be modified from EventBridge.